# 170 questions

Tagged
• x
144
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## nRF51 DK - need to press RESET button to relaunch BLE advert. (and fails) [closed]

Hello,

Today I've a strange behavior of nRF51 DK (everything was working ok until today, the last things I did was to reset the J-link FW after a total erase of the board).

Now, when I upload the Softdevice ... (more)

34
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no
1

## nRF51-DK: Can't enter in sleep mode during connection

I'm running the HID Keyboard example from SDK 12.2.0 on nRF51-DK with SD 130.

When I long push Button1, it disconnects for a moment and connects again immediately.

Events in the function bsp_event_handler(bsp_event_t event) are generated ... (more)

320
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no
3

## Windows 10 Problem?

I am using the nrf51-dk on windows 10 and I tried to apply the latest mbed bootloader. After I do that and restart the chip, the device seems to mount and dismount repeatedly. I tried to download a simple program ... (more)

36
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no
1

## Force SPI transfer and a PWM signal in sync.

I am trying to control a current measurement chip (DDC114) that works with a protocol that is close (enough) to SPI. It has 2 channels, s.t. it can be read out and integrating at the same time. The switch ... (more)

38
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2
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## Programming a chip externally using nRF51-DK

Is it possible to program the Atmel SAM D20E chip (based on an ARM-M0 cortex processor) externally using the P19 debug out header on the nRF51-DK?

Thanks.

32
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1

## Pulsewidth modulation with app_pwm results in NRF_ERROR_INVALID_STATE

I have a nrf51-DK. I am trying to get a PWM signal on one pin. Here is my code:

static volatile bool ready_flag;

void test_pwm(){
APP_PWM_INSTANCE(PWM1,2);                   // Create the instance ...
(more)

101
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3
2

## add characteristics with distinct uuids (128-bit)

Hi,

I have created a custom service, and now I want to add different characteristics to it but with completely different uuids, not only the 12-13 octets.

This service will have 23 characteristics with completely different UUIDS. I tried to ... (more)

49
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1
vote
1

## Transmitting 16 bit at once over SPI on nRF51-DK

Forgive me if this is a stupid question, but I am new to programming microcontrollers other than Arduino and SPI in general.

I have a DAC that has a 16-bit register and I need to write to it using SPI ... (more)

37
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no
no

## Errorcode: CouldNotFindJprogDLL (0x2)

I can't open a com port after starting the nRF Connect app. This happens in Windows (native) and also a Linux virtual host with the com port passed through. I'm using a nRF51 DK.

Unable to read connectivity ... (more)

49
views
1
vote
1

## How to configure NRF51-DK to flash firmware to a different nrf51 module

Hi all, I have here NRF51-DK, I am a bit familiar with the kit for a while. Now I want to make a system using NRF518422 chip. I manage to find a module - "Taiyo Yuden EYAGJNZXX".

My question is, Is ... (more)

77
views
1
vote
1

## config required for multiple ble devices

Hi, I am using SDK v12.2 and gcc compiler. S132 softdevice for nrf51 controller.

I am using muliple nrf51 devices to connect each other and share sensor data with each other. I am thinking to set one as central ... (more)

506
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2
2

## nRF51 DK soft devices examples not working

Hi,

I have an nRF51 DK, found here https://www.nordicsemi.com/eng/Produc.... I am using SDK V11.0 and S130 V2.0. I am developing on a Linux machine.

I can compile and run the blinky example successfully ... (more)

607
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no
2

## Problem in twi/i2c communication receiving data

Hi<br> I'm trying to communicate between nrf51-DK and arduino using twi. I was able to send data from nrf51-DK to arduino using nrf_drv_twi_tx but when I'm trying to send the data from arduino to DK, I'm ... (more)

236
views
2
1

## nrf_mesh_init/nrf_mesh_node_config causing MESH ASSERT

I am testing out the Bluetooth Mesh SDK 0.9.1 Alpha using the light control client/server example. The examples have not been modified.

I have set up a nRF52 development kit as the client, and a nRF51 development ... (more)

58
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no
no

## FCS errors only in last bit of CRC and not the rest of the packet

I am using the esb_tx example on an nRF51 DK board modified to send BLE advertising packets at 1 KHz.

I am receiving the packets on a BlueTooth sniffer. The contents of packets is fine, but about 5% of the ... (more)

341
views
1
vote
2

## Can nRF51422 or nRF51822 can be used as bluetooth device for Raspberry pi?

Can nRF51422 or nRF51822 can be used as bluetooth device for Raspberry pi?

As I can see on the terminal Linux, the hciconfig log says, raspberry pi 3's Bluetooth device is connected to board with UART Connection.

I'm ... (more)

74
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2
2

## How Can I limit Gatt Data bytes that I write? (Not With Zero-Fill)

I created an characteristic that has MAX_Length = 20 Bytes characteristic.

And When I'm trying to write less than 20bytes on this Characteristic, It Always send with 20Bytes with Zero filled data bytes.

For example, I'd like to write ... (more)

341
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no
2

## nrfgo studio doesn't see my custom board

Hello all,

I am trying to program my custom board using the debug out from the nrf51-DK. I connect all the needed pins and on the nrfgo select the Segger but when I do this my nrf51-DK resets and it ... (more)

96
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no
1

## nRF51 DK won't connect with nRF Toolbox

Hello,

I'm wondering if my nRF DK51 is not broken as it behaves quite strange when trying to connect with a BLE Central (iOS and Android devices). For most of the part everything is ok (flashing, RTT, UART, BLE ... (more)

218
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no
1

## Looking for KiCad shield design for nRF51-DK (or nRF52-DK)

Our workshop is using custom PCBs for other manufacturer's developer kits, and I'd like to do a similar shield for our nRF51-DK boards. Can anyone provide a KiCad project file including schematic and board?

122
views
1
vote
1

## What defines the RSSI update rate for nRF51 devices?

I'm working on a project based on the ble_app_uart_c central example in SDK 12.1. I'm polling the RSSI of a Nordic beacon using sd_ble_gap_rssi_get(), and the fastest update in RSSI I can get is between 60 and ... (more)

118
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no
1

## NRF51-DK programming custom board problem

I'm trying to program a nRF51822 custom board using Debug out pin P19 of NRF51-DK through Keil MDK, here is the problem I encounter:

To simplify I just use the simple blinky_s130_pca10028 project. First I compile and load the ... (more)

98
views
1
vote
1

## nRF51 DK Dimensions and Drawing Needed

I haven't been able to find a drawing file for the nRF51 Development Kit. Is there one out there?

Ideally, I'd like to get the drawing and a *.STP file for SolidWorks.

384
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3
1

## PPK: Unable to connect to the ppk, check debugger connection and make sure pynrfjprog is up to date

I'm trying to use the PPK with an nRF51 dev board, and I'm getting this output whenever I try to start the PPK Software:

Checking installed packages
pyside:      1.2.4
pyqtgraph:   0.10.0
numpy:       1.11 ...
(more)

196
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no
1

## Use RTC or app_timer?

Hello, i need to count 1 or 2 minutes. Someone can recommend me if to do that is easier to use app_timer or RTC?

Which is the value that i have to put in the prescaler?

I work with nRF51 ... (more)

341
views
no
no

## What are the list of things to mind when porting a project to nRF51 DK Boards?

Hello, this is what I can think of when porting a project, but before that, a little background about my project:

it uses BLE (duh)

it uses uart to print test output

it uses buttons and leds as runtime indication ... (more)

253
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no
1

## How can i see the RSSI value in nRF51 dk?

Im based in the example of SDK12.0 - MULTILINK_CENTRAL and i have to know the RRSI value in dbm if it is possible from the peripheral device that is connected to me but i couldn't do that.

Somebody can ... (more)

490
views
3
1

## SPI pin on nrf51 DK

Hi All,

I have a question about the SPI pin number on nrf51 Dk.

I don't understand when i look into the pca10028.h file, i see this mapping:

#define SPIM0_SCK_PIN       4
#define SPIM0_MOSI_PIN      1
#define SPIM0_MISO_PIN      3
#define ...
(more)

787
views
1
vote
1

## nRF51 GPIO interrupt

Hello,

I am having interface nRF51 with RF receiver. Output of RF receiver connected with GPIO pin of nRF51.

How can I detect interrupt on gpio pin?

Thanks & Regards, Rajneesh

1k
views
no
1

## Advertising service with 128 bit UUID

Hello everyone,

I have 2 chip; Bluegiga and nRF51-DK

I can easily advertise my custom service in Bluegiga chip. As you can see, nRF Connect application shows my service so that i can scan peripherals with service and connect via ... (more)

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